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arXiv 0802.3755physics.optics
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利用空间光调制器的空间荧光互相关光谱

Spatial fluorescence cross correlation spectroscopy by means of a spatial light modulator

Yoann Blancquaert, Jie Gao, Jacques Derouard, Antoine Delon

摘要:

空间荧光互相关光谱是荧光相关光谱的一个很少被研究的版本,其中来自不同观测体积的荧光信号是互相关的。在所报道的实验中,产生了两个观察体积,通常偏移几个$μ$ m,具有空间光调制器和两个可调节的针孔。我们通过以下几个方面说明了这种技术的可行性和潜力:i)测量在0.2 - 1.5 $μ$ m/ms范围内,接种有荧光纳米珠或罗丹明分子的溶液的分子流(模拟主动输运现象); ii)研究巨单层囊泡的磷脂膜相对于亲水或疏水分子的渗透性(在这种情况下,激光点设置在膜的两侧)。提出了理论描述,并讨论了基于荧光相关光谱的替代方法。

英文摘要:

Spatial Fluorescence Cross Correlation Spectroscopy is a rarely investigated version of Fluorescence Correlation Spectroscopy, in which the fluorescence signals from different observation volumes are cross-correlated. In the reported experiments, two observation volumes, typically shifted by a few $μ$m, are produced, with a Spatial Light Modulator and two adjustable pinholes. We illustrated the feasibility and potentiality of this technique by: i) measuring molecular flows, in the range 0.2 - 1.5 $μ$m/ms, of so-lutions seeded with fluorescent nanobeads or rhodamine molecules (simulating active transport phenomenons); ii) investigating the permeability of the phospholipidic membrane of Giant Unilamellar Vesicles versus hydrophilic or hydrophobic molecules (in that case the laser spots were set on both sides of the membrane). Theoretical descriptions are proposed together with a discus-sion about Fluorescence Correlation Spectroscopy based, alternative methods.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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